So i have a Mallory ignition box, dist, and an autometer 5" tach. When i first fire up the motor it will read a correct RPM for a few moments then drop 500 RPM. My timing light shows the correct RPM which is about 500 RPM higher than what my tach is showing. So at idle its reading 400rpm when its really 900.
I have New coil, new cap, new rotor, new ignition module why the odd job jumping around on my tach? Could it be the mallory box? Its a hyfire VII's.

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